Silicate cement



Patented Apr. 3, 1923.

UNITED s'rArEs PATENT OFFICE.

HERMAN)! OF ELBEBFELD, GERMANY, ASSIGNOB TO FABBENEABRTKEN VORM. FRIEDR. BAYER AND-CO. IN LEVERKUSEN, NEAR COLOGNE-ON-THE-RHINE,

enema. t

No Drawing.

SILICATE criumrr.

Application filed August 11, 1921. Serial No. 491,623.

(enema man. @1111 rnovrsrons or m ACT or mm a, 1921, 41 sum. 1.., 1313.

To all whom it may concern:

Be it known that I, HERMANN WEYLAND,

a citizen of Germany, residing at Elberfeld,

1918; July 1, 1918; Oct. 2, 1919; Eng and,

June 4, 1920, Patent No. 165,659; Switzerland, June 3, 1920), of which thefollowing is a specification.

The present invention relates to the manufacture of new silicate cements comprising essentially mixtures of suitable inor anic bases, such as magnesium oxid, bery ium oxid or mixtures thereof with solutions of silicic acid of high percentage. The solutions of silicic acid are obtained by hydrolysis of certain organic silicon compounds, such as the mono, di, tetra, hexa, and

poly alkyl esters of orthosilicic acid or mixtures of such esters by means of water or dilute acids. In preparing the solutions of silicic acid an alcoholate of an alkaline earth metal or of magnesium or of aluminum or mixtures of such alcoholates may be added to the organic silicon compound advanta geously priorto the hydrolysis.

The cements have proven to be valuable for filling teeth.

v ceeding more fully the following examples are given, the parts being by weight Ezample A'..7.'2 parts of water or hy- 86 drochloric acid are gradually added to 15.3 parts of-tetramethylic silicate Si(OCH whilst cooling. The hydrolysis proceeds with evolution of heat. The solution thus obtained is stable for a long time especially 4 in a closed vessel. For the production of cement this liquid is stirred with 30 parts of a finely powdered mixture of molten feldspar and 0.5 per cent of ma nesium oxid. When the cement is superficial y solidified it is covered with water and is allowed to harden. The cement thus produced is insoluble in water and dilute acids and distinguished by its great hardness.

In order to illustrate this method of prowample B.-15.3 parts of monomethylicsilicate ocno 1 15 parts of water and stirred with 81 parts.

of a mixture of molten and powdered feldspar and 05 part of magnesium oxid. The cement thus prepared hasa greater hardness than that obtained from the simple orthoester.

Ewameple l .25.8 parts of hexamethylio silicate Si O.(OCH and 15.2'parts of i115) with 4 parts of water as detetramethylic silicate Si(OCH are mixed together and heated to boiling with 5 parts of aluminium methylate for one-hour. in a vessel provided 7 with a reflux condenser.

The methylate remains partly insoluble.

The solution is decanted and decomposed with water (25 per cent of its weight); The reaction mass is then stirred for instance I with such a quantity of glass powder con- 01130. H, on 90H:

1. A cement comprising in "admixture, an

inorganic base, and .a solution ofahydrolyzed organic silicon compound.

2. A cement comprising in admixture, an

inorganic base, a solutionof a hydrolyzed organic silicon compound, and feldspar,

inorganic base, anda solution of a hydro-I lyzed alkyl ester of silicic acid.

6. A cement comprising in admixture, an

inorganic base, and a solution of a hydrolyzed tetralnethyl ester of silicic acid.

7 A cement comprising in admixture, magnesium oxid, and a solution of a hydrolyzed tetramethyl ester of silicic acid.

20 8. A cement comprising in admixture,

magnesium oxid, feldspar, and a solution of a hydrolyzed tetramethyl ester of silicic acid.

9. A cement comprising in admixture, magnesium oxid, and a solution obtainable by digesting an alkyl ester of silicic acid with aluminum methylate and hydrolyzing Y the resulting solution.

l0. cement comprising in admixture, a plurality of inorganic bases, and a solution of a hydrolyzed alkyl ester of silicic acid.

11. A cement comprising in admixture, an inorganic base, and a solution ofa hydrolyzed mixture of alkyl esters of silicic acid.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HERMANN VVEYLAND. [1 s] Vitnesses:

HANS BRi'IKNER, [1 5.] EDUARD COMMBERG; [1. s.]

Certificate of Correction.

It-is hereb certified tea in Letters Patent No. 1,450,467, upon the apphcation of Hermann Weyland, of 'Elberfeld, proigement 1n Silicate Cements, anerror apears in the printe ted April 3, 1923, ermang', for an imspecification reqmring correction as follows: Page 2, line 19, aim 7, for the words tetramethyl Y ester? read alkyl-ester; and that the Patent Ofiiee.

" Signed and sealed this lst day of May, A. 1)., 1923. I

d Letters Patent h l correction therem that the same may'c on form to the re cog d ifih z gag g 2%:

KARL FENNING, 9 aommuksionor-of'Pateata; 

